<template>
  <view>
    <!-- 使用自定义的搜索组件  修改自定义颜色 圆角-->
    <!-- <my-search :bgcolor="'pink'" :radius= "5"></my-search> -->
    <my-search @click="gotoSearch"></my-search>
    
    <view class="scroll-view-container">
      <!-- 左侧的滑动区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i === active ? 'active' : '']" @click="activeChanged(i)"> {{item.cat_name}} </view>
          
        </block>
        
      </scroll-view>
      <!-- 右侧的滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <!-- 二级分类的标题 -->
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <!-- 当前二级分类下的三级分类列表 -->
          <view class="cate-lv3-list">
            <!-- 三级分类的Item项 -->
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 三级分类的图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 三级分类的文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>

    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        // 当前设备可用的高度
        wh:0,
        cateList:[],// 左侧分类
        active:0, // 默认激活项
        cateLevel2:[],//二级分类 列表
        scrollTop:0

      };
    },
    onLoad() {
     const sycInfo = uni.getSystemInfoSync()
     // console.log(sycInfo);
     this.wh=sycInfo.windowHeight-50
     
     this.getCateList()
    },
    methods: {
      // 获取分类列表的数据
     async getCateList(){
      const {data:res} = await uni.$http.get('/api/public/v1/categories')
      if(res.meta.status !==200) return uni.$showMsg()
      this.cateList=res.message
      
      //为二级分类赋值
      this.cateLevel2=res.message[0].children
      },
      activeChanged(i){
        // console.log(i);
        this.active=i
        
        // 重新为二级分类赋值
        this.cateLevel2=this.cateList[i].children
        this.scrollTop = this.scrollTop? 0 : 1
      },
      // 跳转到商品列表页面
      gotoGoodsList(item){
        // console.log(item);
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      
      },
      
      gotoSearch(){
        // console.log('OK');
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .left-scroll-view{
    width: 120px;
    
    .left-scroll-view-item{
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      &.active{
        background-color: #fff;
        position: relative;
        
          
        &::before{
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
}

.cate-lv2-title{
  font-size: 12px;font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item {
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    
    image {
      width: 60px;
      height: 60px;
    }
    text {
      font-size: 12px
    }
  }
}
</style>
